ANNA CASE was an American Soprano, who recorded with Thomas Edison, who used her voice extensively in "tone tests" of whether a live audience could tell the difference between the actual singer and a recording. Beyond recording for Edison Records on both cylinder and Diamond disc, Case recorded for Victor and Columbia Records and appeared in a sound film for Vitaphone.
Wikipedia contributors. "Anna Case." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 5 Feb. 2017. Web. 16 Feb. 2017.